Preparation and characterization of a novel interlayer expanded zeolite with a 12 × 12-ring structure

Area of Science:

• Materials Science
• Nanotechnology
• Catalysis

Background:

• Layered materials with specific topological structures are crucial for various applications.
• Modification of layered precursors can enhance their properties and expand their utility.
• Controlling interlayer spacing is key to designing novel molecular sieves.

Purpose of the Study:

• To modify the lamellar precursor PLS-1 through a multi-step process.
• To synthesize a new molecular sieve material with an expanded interlayer structure.
• To investigate the structural characteristics of the modified material.

Main Methods:

• Synthesis of layered precursor PLS-1 using H-magadiite and tetramethylammonium hydroxide (TMAOH).
• Acid treatment to remove organic molecules and subsequent intercalation with organic directing agents (OSDA).
• Interlayer silylation using 1,3-dichlorotetramethyldisiloxane and optimization of reaction conditions.

Main Results:

• Successful modification of PLS-1 precursor via acid treatment, intercalation, and silylation.
• Obtained interlayer-expanded intercalated materials with improved crystallization.
• Characterization confirmed the formation of the new molecular sieve PLS-1-2Si with a 12 × 12-R interlayer expanded structure.

Conclusions:

• The combined acid treatment, intercalation, and silylation strategy is effective for modifying layered materials.
• The synthesized PLS-1-2Si material exhibits a unique interlayer expanded structure.
• This work demonstrates a pathway for designing novel molecular sieves with tailored properties.